Put the waterinto the large bowl. Add the salt, Put theglass in the middle of the bowl. The top of the glass must be above the water., Put theclingfilm over the bowl and the glass. Use the rubber band to make sure there are no gaps between the clingfilm and edge of the bowl. Put a stone on top of the clingfilm., If you put the bowl outside in the sun, what will happen tothewater? Let’ssee., the water will get hot. The water will then become gas, but the salt won’t become gas. , The salt will stay in the bowl and the gas will rise and hit the clingfilm, Then it will become water again and fall into the glass.

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